When Sejanus was plotting revolution, although he [Note 1] saw the man's birthday publicly celebrated and his goldenstatues honoured everywhere, yet it was with difficulty that he at last overthrew him, rather by craft and deceit than by his imperial authority. First of all, to remove him from his person under colour of showing him honour, he chose him as his colleague in a fifth consulship [31 A.D.], which, with this very end in view, he assumed after a long interval while absent from the city. Then beguiling him with hope of marriage into the imperial family and of the tribunicial power, he accused him when he least expected it in a shameful and pitiable speech, begging the senators among other things to send one of the consuls to bring him, a lonely old man, into their presence under military protection. Even then distrustful and fearful of an outbreak, he had given orders that his grandsonDrusus, whom he still kept imprisoned in Rome, should be set free, if occasion demanded, and made commander-in-chief. He even got ships ready and thought of flight to some of the legions, constantly watching from a high cliff for the signals which he had ordered to be raised afar off as each step was taken, for fear the messengers should be delayed. But even when the conspiracy of Sejanus was crushed, he was no whit more confident or courageous, but for the next nine months he did not leave what was called the Villa of Io.